import itertools
kohteet = ("kettu", "kana", "vilja")
kielletyt = [("kettu", "kana"),
("kana", "vilja")
]
g = Graph()
for vene in range(2):
for c in itertools.chain.from_iterable(itertools.combinations(kohteet, r) for r in range(3+1)):
c1 = tuple(x for x in kohteet if x not in c) #aloituspuoli
y = c1 if vene else c
if any(all(k in y for k in ks) for ks in kielletyt): continue
g.add_vertex((c1, vene))
vs = g.vertices()
for i1, v1 in enumerate(vs):
c1, vene1 = v1
for v2 in vs[i1+1:]:
c2, vene2 = v2
if vene1==vene2: continue
if vene1==0: #vienti
if not set(c2).issubset(set(c1)) or abs(len(c1)-len(c2))>1: continue
if vene1==1: #takaisin tuonti
if not set(c1).issubset(set(c2)) or abs(len(c1)-len(c2))>1: continue
g.add_edge(v1, v2)
g.show(figsize=8)
for p in g.all_paths((kohteet, 0), (tuple(), 1)):
print (p)
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}